How To Launch Servlet from Desktop App

Hello Everyone,
I recently started my programing in JavaEE. First lesson was Servlets.
My servlet takes the name and a number from a user using a html form and returns a wellcoming message to the user and calculates PI with "number" decimals.
Well it works using a html form but the next exercise is to launch the servlet from a desktop application. I searched like 2 hours on google and different sites for this. I saw a hint about creating a framework(code was writen in 2001).
I really really have no idea how to launch the Servlet from a desktop client application.

The exercise says:
PI Servlet
Write a servlet capable of calculating the PI number with a specified number of decimals. Access this servlet:
1. From a browser, using a HTML form
2. From a desktop application
For the calculation of PI use Machin formula PI/4 = 4 arctan(1/5) - arctan(1/239) or a similar one.
For the calculation of arctan function use Taylor series: arctan(x) = x - (x^3)/3 + (x^5)/5 - (x^7)/7 + (x^9)/9 ...
My servlet looks like this: without the Methods for calculating PI:
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
         try {
            int len = request.getContentLength();
            byte[] input = new byte[len];
            ServletInputStream sin = request.getInputStream();
            int c, count = 0 ;
            while ((c = sin.read(input, count, input.length-count)) != -1) {
                count +=c;
            sin.close();
            String inString = new String(input);
            int index = inString.indexOf("=");
            if (index == -1) {
                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
                response.getWriter().print("Eroare la servlet");
                response.getWriter().close();
                return;
            String value = inString.substring(index + 1);
            //decode application/x-www-form-urlencoded string
            String decodedString = URLDecoder.decode(value, "UTF-8");
            int decc = Integer.parseInt(decodedString);
            String result = CalculatePI(decc).toString();
            PrintWriter out = response.getWriter();
            try {
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Pi Servlet</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Pi Servlet </h1>");
            out.println("<p> Wellcome <br /> PI cu "+ decodedString + "zecimale este: <p>");
            out.println("<br />" + result);
            out.println("</body>");
            out.println("</html>");
        } finally {
            out.close();
            // set the response code and write the response data
            response.setStatus(HttpServletResponse.SC_OK);
            OutputStreamWriter writer = new OutputStreamWriter(response.getOutputStream());
            writer.write(decodedString);
            writer.write(result);
            writer.flush();
            writer.close();
        catch (IOException e) {
            try{
                response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
                response.getWriter().print(e.getMessage());
                response.getWriter().close();
            catch (IOException ioe) {
    } The Html form :
<form action="PiServlet" method ="POST">
    Give PI decimals <input type="text" name="PI" size="20"><br />
    <input type="submit" value ="Submit" >
    <input type ="reset" value="Reset" >
</form>And my desktop application :
public static void main( String [] args ) throws Exception {
           if (args.length != 1) {
         System.err.println("errrrr");
         System.exit(1);
     String piString = URLEncoder.encode(args[0], "UTF-8");
     URL url = new URL("http://localhost:8084/MySecondServlet/");
     URLConnection connection = url.openConnection();
     connection.setDoOutput(true);
     OutputStreamWriter out = new OutputStreamWriter(
                              connection.getOutputStream());
     out.write("string=" + piString);
         System.out.println(piString);
     out.close();
     BufferedReader in = new BufferedReader(
                    new InputStreamReader(
                    connection.getInputStream()));
     String decodedString;
     while ((decodedString = in.readLine()) != null) {
         System.out.println(decodedString);
     in.close();
    }Edited by: ELuCID on Jul 22, 2009 9:42 PM
Edited by: ELuCID on Jul 22, 2009 10:11 PM

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